Duplicating with the aid of stencils



July 29, 1930.

D. GESTETNER DUPLIGATING WITH THE AID OF STENCILS Filed NOV. 29, 1927 relatiwly tpff Fig.2.

ad/z esive material.

Patented July 29, 1930 UNITED STATES PATENT OFFICE DAVID GESTETNER, OF TOTTENHAM HALE, LONDON, ENGLAND, ASSIGNDR TO 1).

GESTETNER, LIMITED,

01 DON DON, ENGLAND DUPLIGATING WITH THE AID F STENCILS Application filed November 29, 1927, Serial No.

. with a carrier formed of woven silk.

It is common experience that when the I openings in the stencil are of considerable dimensions an excess amount of ink will be delivered on to thedmpression-receiving surface and in order to reduce the amount of ink passing through the openings in the stencils produced by photographic means I have proposed to provide the openings with inkresisting elements or to associate the stencil sheet with a sheet of porous material over the surface of which are distributed inkresisting elements.

In duplicating with the aid of stencils cut by means of a stylus or typewriter the quantity of ink which is delivered through the openings in the stencil on to the impression-receiving surface may with advantage also be considerably reduced.

The means above referred to are, however. scarcely suitable for use in association with stencils of this character. v

A reduction in the quantity of ink passing through the openings in a stencil may be secured and theappearance of the reproduction improved by the interposition of one or more sheets of highly porous material, such as yoshino paper, between the silk sheet functioning as a carrier for the stencil and the stencil itself.

If one or more sheets of yoshino paper secured to a sheet of ordinary paper provided atone end'with perforations or slots adapted to facilitate mounting the yoshino paper are employed it requires a certain amount of skill to ensure that the yoshino paper shall lie on the silk-carrier without wrinkles.

One of the objects ofthe present invention is to facilitate mounting a sheet of highly porous material, forinstance yoshino paper,

236,590, and in .Great Britain January 17, 1927.

or a lurality of such sheets, on the carrier of a uplicating machine. The invention consists broadly in associating with the sheet of yoshino paper or with a plurality thereof a sheet of relatively stiff non-stencilizable paper or the like in such manner that the several sheets are in temporary adhesive connection one with the other over substantially the whole area of their adjacent faces.

The invention also consists in a combination or collation of sheets of material including one or more sheets of highly porous ma- 7 terial and a sheet of relatively stifl' non steneilizable paper or the like in temporary adhesive connection one with the other over substantially the whole area of their adjacent faces.

For securing adhesion of the desired character a non-drying or substantially-non-drying material of an adhesive nature may be. employed; for example in accordance with the invention petroleum jelly may be 'used'.

Normally the yoshino paper or other highly porous material will be secured to a heading whereby it may be associated with the means -adapted to fasten the stencil to the stencil carrier 'of the duplicating machine.

Thus. for example, in accordance with the invention, one or, if desired. a plurality of sheets of yoshino paper may be secured to a heading such as is at present customarily associated with a stencil sheet, a sheet of relatively stiff non-stencilizable material, for instance greaseproof paper, being secured to the sheet or sheets of yoshino paper by a layer of non-drying or hardening or slowdrying or hardening adhesive material interposed between and extending substantially over the whole area of the adjacent face: of the yoshino paper and the said s cc The invention will be further described with reference to the accompanying drawings, in which Figure 1 is a front elevation, and Figure 2 a side elevation of the device. according to the invention.

Referring to the figures, 1 is the heading provided with slots 2 wherebythe same may by its heading to the stencil carrier the sheet of relatively stiff material may be peeled in a downward direction from the heading.

With a device in accordance with the invention and as illustrated in Figures 1 and 2 the heading fastening means is connected with the fastening device secured to the stencil carrier of the machine and the sheet smoothed down so as to bear on the stencil carrier after which the sheet of relatively stiff material is peeled away in a direction substantially parallel with the stencil car- '7 rier. such action causing the sheet of yoshino paper to be stretched smoothly over the latter and brought into intimate contact with it. Before. however, peeling off the sheet of relatively stifl' material. the duplicating machine is adjusted so that the pressure roller will rise and the machine should be allowed to operate for a brief period until the sheet of yoshino paper is adjudged to be sufficiently impregnated with ink.

The sheet of relatively stiff non-stencilizable material is preferably or ,ordinarily transparent or translucent, partly because material of this character is more or less greaseproof and artly because the use of such material facilitates determining when the ink has been caused by the operation of the machine as above described to impregnate or permeate the yoshino paper.

After the above-mentioned operations have been completed I the stencil may be mounted on the duplicating machine in the usual manner. I

In the above description the expressions sheet of relativelv stiff material and relatively stiff paper have been used and it has been indicated that more or less greaseproof paper may be employed. An indication of a. suitable degree of stiffness of the sheet is thus furnished.

The type of greaseproofpaper which may beused is conveniently that known as glucose paper which is a thin substantially transparent paper frequently used as an outer covering for packages containing cigarettes and the like.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. For use in stencil duplicating a combination or assembly of sheets comprising a sheet of uncoated yoshino paper permanently secured at one end to a sheet of non.

stencilizable paper provided with means for engaging the stencil carrier of a duplicating machine and temporarily secured by a nondrying adhesive over the remainder of one of its faces to a sheet of non-stencilizable grease-proof paper.

2. For use in stencil duplicating a combination or assembly of sheets of material including a sheet of uncoated highly porous material and a sheet of relatively stiff nonstencilizable material in temporary adhesive connection one with the other over substantially the whole area of their adjacent faces.

3. For use in stencil duplicating a combi nation or assembly of sheets including a sheet of uncoated highly porous material permanently secured at one end to a sheet of non-stencilizable paper provided with means for engaging the .stencil carrier of a duplicating machine and temporarily secured by a non-drying adhesive over the remainder of one of its faces to a sheet of relatively stiff paper.

In testimony whereof I have signed my name to this specification.

DAVID GESTETNER. 

